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Effects of slash management on tree growth and nutrient cycling in second-rotation Eucalyptus replanted sites in the Congo

Nzila J.D.D., Deleporte P., Bouillet J.P., Laclau J.P., Ranger J.. 2004. In : Nambiar E.K.S. (ed.), Ranger Jacques (ed.), Tiarks A. (ed.), Toma T. (ed.). Site Management and productivity in tropical plantation forests : Proceedings of Workshops in Congo July 2001 and China February 2003. Jakarta : CIFOR. Workshop on Site Management and Productivity in Tropical Plantation Forests, 2001-07-07/2001-07-13, Pointe-Noire (Congo).

Since 1998 an experiment has been conducted in the Congo to evaluate harvesting methods with respect to sustainable management of eucalypt plantations. The results showed: (1) a marked negative effect on tree and stand growth when all slash materials were removed; (2) a risk of nutrient teaching after harvesting due to the high rate of decomposition of organic residues; (3) a production of inorganic nitrogen in the surface soil layer which depends on slash management; and (4) a high rate of nitrification and a risk of N tosses in the early stage of stand development.

Mots-clés : plantation forestière; eucalyptus; rotation de coupe; croissance; transport des substances nutritives; congo

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